/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.hasor.search.server.servlet;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.nio.charset.StandardCharsets;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.StringEscapeUtils;
import org.apache.solr.core.CoreContainer;
import org.apache.solr.core.SolrCore;
/**
 * A simple servlet to load the Solr Admin UI
 * 
 * @since solr 4.0
 */
public final class LoadAdminUiServlet extends BaseSolrServlet {
    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
        // This attribute is set by the SolrDispatchFilter
        CoreContainer cores = (CoreContainer) request.getAttribute("org.apache.solr.CoreContainer");
        InputStream in = getServletContext().getResourceAsStream("/admin.html");
        if (in != null && cores != null) {
            try {
                response.setCharacterEncoding("UTF-8");
                response.setContentType("text/html");
                Writer out = new OutputStreamWriter(response.getOutputStream(), StandardCharsets.UTF_8);
                String html = IOUtils.toString(in, "UTF-8");
                Package pack = SolrCore.class.getPackage();
                String[] search = new String[] { "${contextPath}", "${adminPath}", "${version}" };
                String[] replace = new String[] { StringEscapeUtils.escapeJavaScript(request.getContextPath()), StringEscapeUtils.escapeJavaScript(cores.getAdminPath()), StringEscapeUtils.escapeJavaScript(pack.getSpecificationVersion()) };
                out.write(StringUtils.replaceEach(html, search, replace));
                out.flush();
            } finally {
                IOUtils.closeQuietly(in);
            }
        } else {
            response.sendError(404);
        }
    }
}
